#VERIFICATION-XENIAL
- Before the update
ubuntu@iscsi_base:~$ dpkg -l | grep open-iscsi
ii open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.5
amd64 iSCSI initiator tools
ubuntu@iscsi_base:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.122.1
domainsearch example.com
ubuntu@iscsi_base:~$ strace ping -c1 www 2>&1 | grep www
execve("/bin/ping", ["ping", "-c1", "www"], [/* 20 vars */]) = 0
sendto(3, "=\370\1\0\0\1\0\0\0\0\0\0\3www\0\0\1\0\1", 21, MSG_NOSIGNAL, NULL,
0) = 21
recvfrom(3,
"=\370\201\203\0\1\0\0\0\1\0\0\3www\0\0\1\0\1\0\0\6\0\1\0\0*0\0@"..., 1024, 0,
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.122.1")},
[16]) = 96
write(2, "ping: unknown host www\n", 23ping: unknown host www
- After the update
ubuntu@iscsi_base:~$ dpkg -l | grep open-iscsi
ii open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.6
amd64 iSCSI initiator tools
ubuntu@iscsi_base:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.122.1
search example.com
ubuntu@iscsi_base:~$ strace ping -c1 www 2>&1 | grep www
execve("/bin/ping", ["ping", "-c1", "www"], [/* 20 vars */]) = 0
sendto(3, "\241\223\1\0\0\1\0\0\0\0\0\0\3www\7example\3com\0\0\1\0"..., 33,
MSG_NOSIGNAL, NULL, 0) = 33
recvfrom(3, "\241\223\201\200\0\1\0\1\0\0\0\0\3www\7example\3com\0\0\1\0"...,
1024, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("192.168.122.1")}, [16]) = 49
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https://bugs.launchpad.net/bugs/1791108
Title:
open-iscsi uses domainsearch instead of search for /etc/resolv.conf
Status in open-iscsi package in Ubuntu:
Fix Released
Status in open-iscsi source package in Xenial:
Fix Committed
Status in open-iscsi source package in Bionic:
Fix Committed
Status in open-iscsi source package in Cosmic:
Fix Released
Bug description:
[Impact]
* open-iscsi is adding "domainsearch", a non-existent configuration
option, instead of "search" in /etc/resolv.conf. As a result, the
search list is ignored in the clients.
[Test case]
* Install an ubuntu machine that uses iscsi as root, and does not use
systemd-resolvd.
* Prepare the dhcp server to provide the search list to its clients. For
instance, in dnsmasq:
dhcp-option=option:domain-search,canonical.com
* Boot the machine and check the content of /etc/resolv.conf
- if domainsearch is present, the search list will be ignored:
root@iscsi-xenial:/home/ubuntu# ping -c1 golem
ping: unknown host golem
root@iscsi-xenial:/home/ubuntu# strace ping -c1 golem 2>&1 | grep golem
execve("/bin/ping", ["ping", "-c1", "golem"], [/* 19 vars */]) = 0
sendto(4, "_(\1\0\0\1\0\0\0\0\0\0\5golem\0\0\1\0\1", 23, MSG_NOSIGNAL, NULL,
0) = 23
recvfrom(4, "_(\201\203\0\1\0\0\0\0\0\0\5golem\0\0\1\0\1", 1024, 0,
{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.122.1")},
[16]) = 23
write(2, "ping: unknown host golem\n", 25ping: unknown host golem
- if search is present, the search list will be used:
root@iscsi-xenial:/home/ubuntu# ping -c1 golem
PING golem.canonical.com (91.189.89.199) 56(84) bytes of data.
64 bytes from golem.canonical.com (91.189.89.199): icmp_seq=1 ttl=57
time=63.7 ms
--- golem.canonical.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 63.735/63.735/63.735/0.000 ms
root@iscsi-xenial:/home/ubuntu# strace ping -c1 golem 2>&1 | grep golem
execve("/bin/ping", ["ping", "-c1", "golem"], [/* 19 vars */]) = 0
sendto(4, "\1\\\1\0\0\1\0\0\0\0\0\0\5golem\tcanonical\3com"..., 37,
MSG_NOSIGNAL, NULL, 0) = 37
recvfrom(4, "\1\\\201\200\0\1\0\1\0\0\0\0\5golem\tcanonical\3com"..., 1024,
0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("192.168.122.1")}, [16]) = 53
write(1, "PING golem.canonical.com (91.189"..., 145PING golem.canonical.com
(91.189.89.199) 56(84) bytes of data.
64 bytes from golem.canonical.com (91.189.89.199): icmp_seq=1 ttl=57
time=63.5 ms
write(1, "--- golem.canonical.com ping sta"..., 157--- golem.canonical.com
ping statistics ---
[Regression potential]
* The change is minor (a string replacement) and it's currently not working.
* Any possible regression would involve continuing to break DNS resolution.
[Other info]
* resolv.conf man page: http://man7.org/linux/man-
pages/man5/resolv.conf.5.html
[Original description]
Having an interface file such as /run/net-eno2.conf with the following
content:
DEVICE='eno2'
PROTO='dhcp'
IPV4ADDR='10.10.10.10'
IPV4BROADCAST='10.10.10.255'
IPV4NETMASK='255.255.255.0'
IPV4GATEWAY='10.10.10.1'
IPV4DNS0='169.254.169.254'
IPV4DNS1='0.0.0.0'
HOSTNAME=''
DNSDOMAIN='test.com'
NISDOMAIN=''
ROOTSERVER='169.254.169.254'
ROOTPATH=''
filename='/ipxe.efi'
UPTIME='45'
DHCPLEASETIME='86400'
DOMAINSEARCH='test.com'
net-interface-handler translates it to:
nameserver 169.254.169.254
domainsearch test.com
instead of:
nameserver 169.254.169.254
search test.com
The problem is that domainsearch is not a valid configuration option
for /etc/resolv.conf and is ignored.
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https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1791108/+subscriptions
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